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2 Electricity

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Question 5
F

An electric heater has a metal case and is connected to the mains by a three-core cable. The live wire inside the heater has come loose and is touching the metal case.

Figure: An electric heater with a metal case, showing the live wire touching the case

image

a.

The heater is correctly earthed.

Explain how the earth wire keeps the person in the figure safe.

[3]
b.

Give one reason why the heater is unsafe to use if the earth wire is broken.

[1]
Markscheme

2 Electricity Questions

  1. GCSE
  2. /Physics
  3. /2 Electricity

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